My PC isn't a very good one and that's why I've excepted the fact that Doom 3 runs terrible. But now I've had experience with Far Cry 1 and Crysis 1, and Far Cry 1 ran perfectly at highest settings and Crysis, the mighty God of gaming, ran fine on medium. So can anyone at least give me a reason if not a fix as to why Doom 3 no matter what I do with the graphics settings always chugs away at the frame rate especially when an enemy A.I. is spawned?

My specs are:Windows 7 Home Premium 64 bitAMD E-300 APU, which is a dual-core with 1.3 GHz (Yes, this piece of garbage can run Crysis. Even on Medium-Low I'm surprised.)AMD Radeon HD 6310 for Graphics4GB of RAM

I would like at least an explanation for this. Judging by my performance with Far Cry I should have been able to run this on highest settings without a problem but apparently I should have gone with buying this and Resurrection of Evil for the original Xbox like I originally planned.